Definition of spruce budworm
: a tortricid moth (Choristoneura fumiferana) whose larva feeds on evergreen trees (as spruce and balsam fir) in the northern United States and Canada; also : a related moth (C. occidentalis) of the northwestern United States and adjacent Canada
First Known Use of spruce budworm
Learn More about spruce budworm
Britannica.com: Encyclopedia article about spruce budworm
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